My NV4500 went boom this morning on the way to ski at Snoqualmie with my wife and daughter in tow. I was driving in fifth gear at the time and with a loud bang and grinding the truck was done. No motivation in any gear, bad sounds. Q: Does this sound like a 5th gear failure or an input failure? Q: I'm running an AA housing. How do I identify which series transmission it is? Q: Recommendations on NV4500 replacements and parts?